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Why a .5 point is important

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  • Why a .5 point is important

    I was asked in my pick thread earlier why I was concerned about a .5 point difference when evaluating a game. I gave a short answer there. Here is the long version of that answer.

    When I evaluate games I look at a few key statistics and then I set a line. This line is of course an estimation of what I feel the representative score of the 2 teams would be over a large sampling of games. For example...Let's say I decide that Team A is likely to score 89 points against Team B and Team B is likely to score 95 points. This doesnt mean in anyway that they score will necessarily reflect this for this one game. One team may get hotter than usual or one team could get colder than usual. what this score represents is that this is what I believe to be the average outcome of scores if these 2 teams were to play indefinately under the current circumstances over and over again.

    Now...How does this reflect my idea that .5 points can matter. Well when we evaluate our performance we can only do it a game at a time. So we have to have some backing for the belief that we are properly handicapping games. Through analysis we will find that we have to have a cutoff between where our system works and where it stops working. This will happen when the system finds a place where it can actually beat the juice we must lay. If our system is tight and better at setting lines than the books than we will find these equitable lines to be more numerous at a lower differential say...3 points for basketball and 2 points for football. Let's say you arent as good at determining line values then your edge may lie only on a larger differential like 4 or 3 respectively. Because this averaging out occurs over a large number of games a half a point can make a huge deal.

    let's put it this way. Let's say we look at 100 bets that we've placed. we've hit 60%...Yay!!! Well out of 60 bets we've nailed the hook 5 times (actually a pretty reasonable number) or 5% so if we didnt have that half point on those 5 bets than we would have only hit 55% and would barely be beating our book. This is why .5 points can make a very large difference in your wagering and should be noted when playing a game.

    BOL

    PK
    No thrills, frills, spills or write-ups. Just givin ya the winners everyday.

  • #2
    But if you had to bet -120 instead of -110 on 100 bets, you'd actually be better off just losing those 5 games, I believe, I could be wrong. Let's do the math
    At -120 if you win 60 units and lose 40, you're actually losing 48 units = +12 units
    At -110 if you win 55 units and lose 40, you're actually losing 44 units = +11 units

    so it's pretty close

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    • #3
      Originally posted by BigWeiner View Post
      But if you had to bet -120 instead of -110 on 100 bets, you'd actually be better off just losing those 5 games, I believe, I could be wrong. Let's do the math
      At -120 if you win 60 units and lose 40, you're actually losing 48 units = +12 units
      At -110 if you win 55 units and lose 40, you're actually losing 44 units = +11 units

      so it's pretty close
      I'm be no means an expert, but I NEVER buy the half point in basketball...........anymore. I used to do it, but when I ran some analysis it was hurting me over time. Buying the half in baskets just seems very arbitrary to me. Football is a different story, and I do still buy the half in football. The main difference in the two sports to me is that it seems much more obvious when to buy the half in football. I'm usually an underdog player, so I'll buy 7 to 7.5, 10 to 10.5, 14 to 14.5, 17 to 17.5, etc.......the common margins of victory/defeat. You know not to buy 2 to 2.5, 5 to 5.5, 8 to 8.5, 9 to 9.5, 12 to 12.5, etc in football. In basketball there are no common winning/losing margins. A 5 point margin is just as common as a 1, 2, 3, 7, 8, 9, 10, 18, 24, etc. That being the case, in baskets it seems to me that you have to buy the half on every game, or don't buy it on any game. It is simply guesswork to pick which games to buy a half on in baskets IMO.

      Now maybe POS is talking about multiple books and line shopping, and not about laying -120 to buy a half. That makes sense. But if you are talking about buying the half, count me out. You also have to realize that buying a half doesn't turn a loss into a win. It turns a would be loss into a tie, or a would be tie into a win. You have to buy a full point to have the ability to turn a loss into a win.
      Last edited by harold_bush; 02-19-2009, 03:49 PM.

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      • #4
        Originally posted by harold_bush View Post
        I'm be no means an expert, but I NEVER buy the half point in basketball...........anymore. I used to do it, but when I ran some analysis it was hurting me over time. Buying the half in baskets just seems very arbitrary to me. Football is a different story, and I do still buy the half in football. The main difference in the two sports to me is that it seems much more obvious when to buy the half in football. I'm usually an underdog player, so I'll buy 7 to 7.5, 10 to 10.5, 14 to 14.5, 17 to 17.5, etc.......the common margins of victory/defeat. You know not to buy 2 to 2.5, 5 to 5.5, 8 to 8.5, 9 to 9.5, 12 to 12.5, etc in football. In basketball there are no common winning/losing margins. A 5 point margin is just as common as a 1, 2, 3, 7, 8, 9, 10, 18, 24, etc. That being the case, in baskets it seems to me that you have to buy the half on every game, or don't buy it on any game. It is simply guesswork to pick which games to buy a half on in baskets IMO.

        Now maybe POS is talking about multiple books and line shopping, and not about laying -120 to buy a half. That makes sense. But if you are talking about buying the half, count me out. You also have to realize that buying a half doesn't turn a loss into a win. It turns a would be loss into a tie, or a would be tie into a win. You have to buy a full point to have the ability to turn a loss into a win.
        You are correct Harold. what I was talking about in the thread previous was that someone was asking me why I had waited for the line to move a .5 point before actually buying the line. I dont buy half points in BB because as you said they are arbitrary and the juice is terrible to take in order to do this. But as stated above a half point can change a line from a play to a no play or vice versa simply because we have to draw the line somewhere when taking a side vs the spread. I find it much more prevalent in football where the difference between a juice taking bet and a solid winner are much more pronounced. But because it is so less defined in BB we need to be more cogniscent of where that change takes effect in order to place consistent winning bets and to not pass up on these solid investments.

        PK
        No thrills, frills, spills or write-ups. Just givin ya the winners everyday.

        Comment


        • #5
          The Math: This assumes that you have to buy the hook on every game, 100 bets at $100 per game:

          -110 (x = the number of winners out of 100)

          100x = 110(100-x)
          100x = 11000 - 110x
          210x = 11000
          x = 52.38 out of 100

          -120

          100x = 120( 100 - x )
          100x = 12000 - 120x
          220x = 12000
          x = 57.14 out of 100

          You need to hit 4.76 more plays out of 100 to break even. Again this assumes that you must buy that point in all 100 games.
          Let's Hammer the Book.

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          • #6
            I thought you said .5"

            Deano
            You can't drink all day if you don't start in the morning

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